请问下面这些英语句子错在哪里, 还有,应该怎么改?

题目

请问下面这些英语句子错在哪里, 还有,应该怎么改?
1.The reasons of the problems,in my opinions,has three.
2.Because the number of cars was too much.
3.People usually wait in the roads.
4.The number of cars increased slowly.
5.The government need to bulid more roads,

答案

1.has应该改为have,因为主语是复数
2.too much应该改为too large
3.on the road,in the street
4.如果上下文都是般时态,increased应该是increases
5.need应该是needs